Synthesis and characterization of some tin(II) and tin(IV) derivatives of 4-acyl-5-pyrazolones. Crystal structure of bis(1-phenyl-3-methyl-4-acetyl-pyrazolon-5-ato)tin(II)
作者:Claudio Pettinari、Fabio Marchetti、Augusto Cingolani、Clara Marciante、Riccardo Spagna、Marcello Colapietro
DOI:10.1016/s0277-5387(00)83014-4
日期:1994.3
Stable, four-coordinated (Q)2Sn compounds have been prepared, where QH is 1-phenyl-3-methyl-4-RC(=O)-pyrazol-5-one (R = CH3, CF3, n-C6H13, C6H5, p-F-C6H4, p-Cl-C6H4, p-Br-C6H4, p-I-C6H4, p-NO2-C6H4, p-CH3O-C6H4). They have been characterized through analytical data, IR and H-1, C-13 and Sn-119 NMR spectroscopy. In the crystal structure of the title compound (8), the tin atom is found in a distorted psi trigonal bipyramidal environment, with the tin lone pair occupying an equatorial site. The diaxial angle O-Sn-O is bent [149.8(2)2)degrees] and two sets of Sn-O distances are found [Sn-O(1) = 2.141 (5) angstrom; Sn-O(3) = 2.133 (5) angstrom; Sn-O(2) = 2.296 (6) angstrom; Sn-O(4) = 2.313 (6) angstrom. Oxidative addition of iodomethane or dihalogens (Br2 or I2) to (Q)2Sn provides a route to new (Q)2R(n)Sn(IV)X2-n compounds (where X = Br or I; R = CH3 or X).